Mayer Brown LLP

Gregory Deis

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Greg Deis is a former federal prosecutor and co-chair of Mayer Brown's White Collar Defense & Compliance practice. Greg’s practice focuses on leading sensitive internal investigations and defending clients in criminal and regulatory proceedings. Greg is also a seasoned trial lawyer, having served as lead trial counsel in numerous criminal jury trials, as well as in civil litigation and arbitration.

Greg has led domestic and cross-border investigations on behalf of a variety of clients across a wide range of industries. He regularly represents corporate and individual clients in investigations led by the US Department of Justice, the Securities and Exchange Commission, state attorneys general and other regulatory bodies. These matters have involved the FCPA/public corruption, commercial bribery, securities laws, US sanctions, the False Claims Act, antitrust, customs, tax, money laundering and environmental offenses. Greg also counsels clients on compliance programs and compliance audits/due diligence arising out of acquisitions and joint ventures.

Greg's complex commercial litigation experience involves various areas of law, including RICO, federal and state securities law, the Lanham Act, antitrust, breach of contract, tortious interference with contract and environmental law.